* Add the ability to modify clip space coordinates in the vertex shader
This introduces MaterialVertexInputs.clipSpaceTransform, a mat4 that
is applied to gl_Position before exiting the vertex stage.
* Address code review comments
If you tried removing `culling: none` from any post-process materials,
everything would be fine in GL but Vulkan would be black because
our full-screen triangle was back-facing.
Continue reading only if you thrive in absurd situations.
- Metal and OpenGL define clip space as Y-up whereas Vulkan is Y-down.
- Metal and Vulkan define tex coords as Y-down whereas OpenGL is Y-up.
* Improve materials under white furnace test
Two major changes:
- Mobile target now implements a cheaper variant of the off specular
peak bias (which moves the reflected vector towards the normal).
This greatly helps with rough surfaces that may otherwise point
toward a bright part of the IBL.
- The indirect diffuse love is now properly attenuated to avoid adding
the energy reflected by the specular layer. This allows dielectrics
to be correctly energy conserving under a white furnace.
- Tweak the (hacky) clear coat layer attenuation to behave properly
under a white furnace.
* Use the same reflected vector modification everywhere
This is an improved workaround for a known limitation with Vulkan
drivers on Android P. The offending SPIR-V sequence was introduced
during shader optimization and can be avoided by using full precision
for certain variables.
This works by aliasing CUSTOM0 - CUSTOM7 to morphing attributes, and by
extending our existing skinning variant.
This PR was tested against some upcoming changes to gltfio.
Issue #1149, #1417
This is a prep step for the upcoming morph feature and does not require
a bump to our material version number.
Stay tuned for a new sample app that demonstrates this feature.
* Make CMake 3.10 the minimum version, add LTO option
* Install a newer CMake on Linux CI builds
* Update LLVM and Cmake on Windows CI
* Update build/windows/ci-common.bat
Co-Authored-By: Ben Doherty <benjdoherty15@gmail.com>
* Update formatting
* Apply suggestions from code review
* Update build/windows/ci-common.bat
* Update CMake
* Switch Android projects back to CMake 3.6
⚠️ breaks materials
There used to be a constraint that ibl cubemap needed to be
256x256. This constraint is now relaxed. IBL cubemaps can be any size.
We also add 16 float4 of padding to the frameUniform, which brings
its size to 1 KiB, the idea is to prevent more breakages in the
future.
This eliminates the flicker caused by triangle noise based dithering
when FXAA is turned on. This will require further investigation to
see if we can use triangle noise with FXAA without such artifacts.
* Add screen and multiply blending modes
This change also fixes a sorting issue: different sorting modes
were sorted in different buckets which is incorrect. We want
to sort only by distance.
* Update release notes and Java API
* Fix build error
This replaces the previous "curvature to roughness" method. Both are related
and rely on the screen space variance of geometric normals but this new
solution offers more control (the screen space variance and the clamping
threshold can be controlled).
* Add micro-shadowing based on ambient occlusion
* Prevent crash when IBL is turned off
* Apply micro-shadows to baked AO only
* Remove debug code
* Add opacity control
* Fix opacity term
* Switch to micro-shadowing from Chan 2018
Also use new default bias parameters that seem to work better with
more scenes.
Renamed SAMPLING_HARD to SAMPLING_PCF_HARD because the GPU still
performs 4-taps PCF.
The previous code worked only for directional lights and didn't handle
LISPSM correctly (the bias was scaled down).
We now apply the bias in world space, which works with all configurations.
Additionally the bias was always wrongly scaled by 2x.
The cost is 3 multiply-add.
